Signal clarifier for radio receiving apparatus



June 10, 1930. w. I. SPANGLER 1,763,270

SIGNAL CLARIFfER FOR RADIO RECEIVING APPARATUS Filed June" .19 1928 Fly. 1

mm; m ll. I

noentoi 11 171122722 1 ,jvaigfle Patented June 10, 1930 PATENT OFFICE WILLIAM I. SPAN GLER, OF TARLTON, OHIO SIGNAL CLARIIFIER FOR RADIO RECEIVING APPARATUS Application filed June 19,

This invention relates to apparatus for removing from radio reception uncontrolled electrical impulses ordinarily known as static disturbances, the primary object of the invention being the provision of improved apparatus whereby such disturbances may be shunted around. the receiving apparatus without being reproduced by the radio apparatus to create sound waves.

With these and other objects in view, which will appear as the description proceeds, the invention consists in the novel features of construction, combinations of elements and arrangements of parts hereinafter more fully described and pointed out in the following claims.

In the accompanying drawings:

Figure 1 is a diagrammatic view of the signal clarifying means comprising the present invention,

Figure 2 is a top plan view thereof, and

Figure 3 is a view in side elevation.

Referring more particularly to the drawings, the numeral 1 designates a radio receiving set, preferably of the type employing an aerial or antenna which is designated by the numeral 2. For the purpose of removing undesired and uncontrolled electrical impulses which are received by the antenna,

, the present invention consists in the provision of a signal clarifier which is designated in its entirety by the numeral 3.

This clarifier consists of a base 4 of an insulating material, upon which is suitably mounted an electro-magnet 5, the coil 6 of this magnet being connected serially with the antenna 2. From the coil 6 current conducting wire 7 extends to the base clip of an armature 8 which is normally spaced from the core 9 of the magnet 5 during ordinary operation of the apparatus.

The receiving current or signal energy passes through the base clip of the armature and enters a metallic socket 10- in which is frictionally secured a resistance cartridge 11. This cartridge comprises a pair of metallic caps 12, one of which being frictionally secured in the socket 10 while the other is frictionally secured in a socket 13. The caps 12 0 are spaced by a glass tube 14:, which tube is 1928. Serial No. 286,508.

adapted to receive a chemical such as salammoniac, vammonium phosphate or kieselguhr in either a liquid or a paste form. Connected with the upper cap 12 is a binding post 15 from which a wire 16 extends to the initial energy receiving coils of the receiving set 1.

The armature 8 is normally spaced from the core 9 of the magnet 5 and is also spaced from an adjustable screw 17, which is carried by a post 18 to which is connected a wire 19 leading to a suitable ground 20, the latter being also connected with the ground side of the radio set by the wire 21. I

In operation, ordinary signal energy of the character used to actuate the set 1 passes through the coils of the magnet 5 from the antenna 2. Thence it travels to the base post of the armature 8, and then through the resistance cartridge 11, where the signal energy may be slightly dampened to remove objectionable noises or signal disturbances which are present frequently in ordinary operation of the set. From the cartridgerthe signal energy flows into the coils, condensers and amplifiers of the set 1 and is returned to the ground 20 by way of the connection 21. In the event, however, of undesired or unusual disturbances in the energy picked up by the antenna, and which disturbances result in the production-of what is known as static sounds,

the relatively strong surges of such disturbances result in creating a magnetic field at the core 9 of sufficient magnetic force to attract the armature 8 toward the core 9, thereby bringing the free end of the armature into contact with the screw 17. Thus, when this condition occurs, instead of the received signal energy passing into the windings of the radio set, the same are shunted so as to pass through the armature 8, the screw 17 and the post 18 and by way of the wire 19 to the ground 20. Thus by the construction set forth the receiving set is momentarily, at least, shunted from the aerial circuit, permitting the aerial circuit to discharge its overloaded condition produced by the more powerful static surges. As soon as these relatively high potential currents have been removed from the aerial circuit the field around the magnet 5 is correspondingly relieved to allow the armature 8 to return to its normal position, at which time the normal operation of the receiving set is resumed.

What is claimed is:

l. A signal clarifier for radio receiving apparatus comprising an electro-magnet having one terminal adapted to be connected with an aerial, the other terminal of said magnet being connected with an armature normally spaced from the pole of said magnet, a ground post normally spaced from said armature but disposed upon the presence of an abnormal electric field around said magnet to be brought into contact with said armature by the movement of the latter in response to said abnormal magnetic field, said ground post having a connection to ground, andv a wire leading from said armature to the current input side 01": a radio receiving set, and a resistance device interposed in the circuit between said armature and the input side of the radio set.

2. A signal clarifier for radio apparatus comprising a base, an electro-magnet mounted on said baseand having one terminal thereof adapted for connection with a signal receiving aerial, an armature normally spaced. from said electro-magnet but movable toward said magnet when the latter is abnormally energized, a ground connection with which said armature contacts when attracted by an abnormal field of said magnet, a connection between the other terminal of said magnet and said armature, a lead extending from said armature to the signal input side of an associated radio receiving apparatus, and a resistance unit interposed in said last named lead.

In testimony whereof I afiix my signature.

WILLIAM I. SPANGLER. 

